Hammer



FIG. 1 is a top, front, right perspective view of an embodiment of the claimed design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a rear elevation view thereof.

The broken lines in the drawings illustrate portions of the hammer which form no part of the claimed design. 

CLAIM We claim the ornamental design for a hammer, as shown and described. 